The usb tool can help you to Reset Default of your NAS, and you may need a clean usb HDD to do it. This will load the factory defaults but won't affect the data stored on the NAS, however, you will have to re-create users account.

Please download USB Tool attached.

1. Arrange an empty USB driver(fat/fat32 format).2. Unzip file to USB root folder and will have following 2 files: [factory_test.sh] & [usb_reset_default]3. Power off NAS (remove HDD).4. Plug USB into NAS and power up.5. Since process completed and NAS going to power off automatically. 6. Remove USB and reboot.